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Radio continuum and polarization study of SNR G57.2+0.8 associated with magnetar SGR1935+2154
High Energy Astrophysical Phenomena · Submitted 29 Nov 2017
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We compared independently determined characteristics like age and distance for both, the SNR and SGR1935+2154, and conclude that they are physically related.
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The abstract, sentence by sentence
We present a radio continuum and linear polarization study of the Galactic supernova remnant G57.2+0.8, which may host the recently discovered magnetar SGR1935+2154. The radio SNR shows the typical radio continuum spectrum of a mature supernova remnant with a spectral index of $\alpha = -0.55 \pm 0.02$ and moderate polarized intensity. Magnetic field vectors indicate a tangential magnetic field, expected for an evolved SNR, in one part of the SNR and a radial magnetic field in the other. The latter can be explained by an overlapping arc-like feature, perhaps a pulsar wind nebula, emanating from the magnetar. The presence of a pulsar wind nebula is supported by the low average braking index of 1.2, we extrapolated for the magnetar, and the detection of diffuse X-ray emission around it. We found a distance of 12.5 kpc for the SNR, which identifies G57.2+0.8 as a resident of the Outer spiral arm of the Milky Way. The SNR has a radius of about 20 pc and could be as old as 41,000 years. The SNR has already entered the radiative or pressure-driven snowplow phase of its evolution. We compared independently determined characteristics like age and distance for both, the SNR and SGR1935+2154, and conclude that they are physically related.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We present a radio continuum and linear polarization study of the Galactic supernova remnant G57.2+0.8, which may host the recently discovered magnetar SGR1935+2154. | contribution 1.00 | 0.82 | 0.08 | hedged possibility 1.00 |
| s1 | The radio SNR shows the typical radio continuum spectrum of a mature supernova remnant with a spectral index of $\alpha = -0.55 \pm 0.02$ and moderate polarized intensity. | result 1.00 | 0.88 | 0.04 | asserted 1.00 |
| s2 | Magnetic field vectors indicate a tangential magnetic field, expected for an evolved SNR, in one part of the SNR and a radial magnetic field in the other. | result 0.98 | 0.89 | 0.04 | asserted 0.73 |
| s3 | The latter can be explained by an overlapping arc-like feature, perhaps a pulsar wind nebula, emanating from the magnetar. | interpretation 1.00 | 0.63 | 0.06 | hedged possibility 0.88 |
| s4 | The presence of a pulsar wind nebula is supported by the low average braking index of 1.2, we extrapolated for the magnetar, and the detection of diffuse X-ray emission around it. | interpretation 0.70 | 0.83 | 0.07 | asserted 0.65 |
| s5 | We found a distance of 12.5 kpc for the SNR, which identifies G57.2+0.8 as a resident of the Outer spiral arm of the Milky Way. | result 0.99 | 0.95 | 0.06 | asserted 1.00 |
| s6 | The SNR has a radius of about 20 pc and could be as old as 41,000 years. | result 1.00 | 0.79 | 0.03 | hedged possibility 0.96 |
| s7 | The SNR has already entered the radiative or pressure-driven snowplow phase of its evolution. | result 0.55 | 0.65 | 0.04 | asserted 1.00 |
| s8 | We compared independently determined characteristics like age and distance for both, the SNR and SGR1935+2154, and conclude that they are physically related. | interpretation 0.78 | 0.91 | 0.86 | asserted 1.00 |
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Original abstract
We present a radio continuum and linear polarization study of the Galactic supernova remnant G57.2+0.8, which may host the recently discovered magnetar SGR1935+2154. The radio SNR shows the typical radio continuum spectrum of a mature supernova remnant with a spectral index of $\alpha = -0.55 \pm 0.02$ and moderate polarized intensity. Magnetic field vectors indicate a tangential magnetic field, expected for an evolved SNR, in one part of the SNR and a radial magnetic field in the other. The latter can be explained by an overlapping arc-like feature, perhaps a pulsar wind nebula, emanating from the magnetar. The presence of a pulsar wind nebula is supported by the low average braking index of 1.2, we extrapolated for the magnetar, and the detection of diffuse X-ray emission around it. We found a distance of 12.5 kpc for the SNR, which identifies G57.2+0.8 as a resident of the Outer spiral arm of the Milky Way. The SNR has a radius of about 20 pc and could be as old as 41,000 years. The SNR has already entered the radiative or pressure-driven snowplow phase of its evolution. We compared independently determined characteristics like age and distance for both, the SNR and SGR1935+2154, and conclude that they are physically related.
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